Retractable marker pen



FIG. 1 is a right front perspective view of a retractable marker pen showing my new design;

FIG. 2 is a right side elevational view;

FIG. 3 is a front elevational view;

FIG. 4 is a left side elevational view;

FIG. 5 is a top plan view; and

FIG. 6 is a fragmentary front elevational view on an enlarged scale, with the clip member partially broken away for convenience of illustration. 

The ornamental design for a retractable marker pen, as shown and described. 